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Product Description

Phenolic Sheet, Bakelite Sheet, Cotton Sheet, Insulation Sheet for High Voltage Application

Bakelite is called phenolic paper laminated sheet.  A hard, dense material made by applying heat and pressure to layers of paper or glass cloth impregnated with phenolic resin. These layers of laminations are usually of cellulose paper, cotton fabrics, synthetic yarn fabrics, glass fabrics or unwoven fabrics. When heat and pressure are applied to the layers, a chemical reaction (polymerization) transforms the layers into a high-pressure thermosetting industrial laminated plastic.

Color: orange red / Black

Good electrical properties
Good mechanical properties
No water absorption
High heat resistance
Good surface hardness
Abrasion resistance
Good insulation

PCB fixture, ICT fixture, pads of drilling machine
Gear, motor, generator, transformer, fixture inverter
Switch, electric insulation part
Generator, transformer, fixture, inverter, motor and electric insulation component.

Properties Grade
Phenolic Cotton Cloth laminated Rod
Properties Units 3723 3725 3726
Density Dia(mm) g/cm3 1.25-1.40 1.25-1.40 1.25-1.40
Water absorption rate (D-24/23) 6 % 1.7 1.2 1
13 1.3 (Φ13mm) (Φ13mm)
25 1
> 25~51 1.2
Flexural strength MPa 90 110 95
Tensile strengh MPa 78 \ \
Compression strength (Axial) MPa 138 138 138
Insulation resistance parallel to laminations \ \
A: Under normal condition W 1.0×108
D-24/23: Immersion in water W \ \ \
Breakdown voltage parallel to laminations (in transformer oil) KV 10 10 10
(20±5°C) (20±5°C) (20±5°C)
Color Natural Natural Natural
Reference standard Enterprise Standard

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